Apache HTTP Server Version 1.3

Apache Virtual Host documentation

The term Virtual Host refers to the practice of
maintaining more than one server on one machine, as
differentiated by their apparent hostname. For example, it is
often desirable for companies sharing a web server to have
their own domains, with web servers accessible as
www.company1.com and
www.company2.com, without requiring the user to
know any extra path information.

Apache was one of the first servers to support IP-based
virtual hosts right out of the box. Versions 1.1 and later of
Apache support both, IP-based and name-based virtual hosts
(vhosts). The latter variant of virtual hosts is sometimes also
called host-based or non-IP virtual hosts.

Below is a list of documentation pages which explain all
details of virtual host support in Apache version 1.3 and
later.

Configuration directives

Folks trying to debug their virtual host configuration may
find the Apache -S command line switch useful. It
will dump out a description of how Apache parsed the
configuration file. Careful examination of the IP addresses and
server names may help uncover configuration mistakes.